just wondering.  thanks.

One that holds a charge and one that doesn’t.

Is that a trick question?

Erik

I don’t mean to be rude, really, but I really do think that the answer is pretty clear and can’t be clearer.

If your battery lifetime is good (within the experimented values that are mentioned here, see groovy’s review for the extended battery - it also contains numbers for the standard one) and you are happy with it, the battery is good.

If the battery either doesn’t work at all or battery lifetime is very poor (i.e. only 1/2 hour without doing anything special… but then again 1/2 hour is already too low if you do anything special), it’s bad.

Sony additionally has a very nice Application for checking the status of your battery. There you can see the number of charge cycles, the nominal capacity, the remaining effective capacity… compare both capacities to each other and you get a good impression if your battery is good… or bad.

That may also depend on what you think is good or bad. If it still has 70% of its nominal capacity, some people might say that’s not bad. That’s still plenty of time to do some work. But others may say that it’s far from it’s original capacity, so it has already gone bad. You decide

Regards,
Julien

i do understand if u use it for a while, the total charge is going down, i.e 90% from the max capacity.  this is normal cause it’s wear and tear, just like any other things.  btw, are there any table or something (guidelines) that tell the users the expected battery capacity in relations with charge cycles?

what i mean by the q is that if u just buy a battery and charge it.  how can u tell if it’s bad or good? besides looking at the nominal value from the power panel software, are there any other ways to tell?

Why cant you just be happy with a laptop battery BENCHMARK test again ?

what’s a laptop battery benchmark test?

usually one that says ‘genuine sony replacement part’ will be the best for your TR